我在 JSX 应用程序中遇到重叠元素的问题

Question

我创建了一个按钮，用于在表单中添加电子邮件输入(用于邀请(，但在一定数量的输入中，它们与页面上的其他元素重叠。

这里有一些 css：

.App {
height: 100%;
}
html,
body,
#root {
margin: 0;
height: 100%;
font-family: "Montserrat";
}
.page {
height: 80%;
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
}
.content {
margin-top: 50px;
width: 400px;
}

(这是一个JSX应用程序(

以下是该页面的屏幕截图： https://paste.pics/ab860613d5fd6eb82dfe59894ee24bc0

感谢您的帮助！

Answer 1

您可以在input周围添加一个"容器"div。从那里，您可以使用height和widthprops以及overflow: 'scroll'属性。

像这样：

const { useState } = React;
// Create items
const NEW_INVITES = [...Array(10).keys()].map((item, index) => {
return {
id: index + 1,
value: index + 1
}
});
function InviteInput(props) {
const { value, onChange } = props;
const handleChange = e => {
onChange && onChange(e);
};
return (
<li>
<input
value={value}
onChange={handleChange}
className="form-input"
type="email"
placeholder="[e-mail]"
name="invites"
required
/>
</li>
);
}
function AddInviteButton(props) {
return (
<button onClick={props.onClick}>
Ajouter une autre personne // (Add another person)
</button>
);
}
function InviteForm({ onSubmit, height, width, addBorder }) {
const [nbInvites, setNbInvites] = useState(NEW_INVITES);
let containerRef;
const onAddInviteClick = () => {
let id = nbInvites.length + 1;
setNbInvites([
...nbInvites,
{
id,
value: id
}
]);
setTimeout((cr) => {
cr.scrollIntoView({ behavior: "smooth" });
}, 100, containerRef);
};
const handleChange = (event, index) => {
let newstate = [...nbInvites];
newstate[index].value = event.target.value;
setNbInvites(newstate);
};
const handleSubmit = event => {
onSubmit(event, nbInvites);
};
const invitesContainer = {
height,
width,
overflow: 'scroll',
border: addBorder === true ? '1px solid black' : '',
}
return (
<div>
<div style={invitesContainer}>
{nbInvites.map((item, index) => {
return (
<InviteInput
key={index}
value={item.value}
onChange={e => handleChange(e, index)}
/>
);
})}
<div ref={r => containerRef = r}/>
</div>
<AddInviteButton onClick={onAddInviteClick} />
<br />
<button onClick={handleSubmit}>Submit</button>
</div>
);
}
function App() {
const [formVals, setFormVals] = useState();
const doSubmit = (event, formValues) => {
setFormVals(formValues);
};
return (
<div className="page">
<h2 className="box-title">
Qui sont les eleves de cette classe ? // (Who are the students in this
class?)
</h2>
<p>
Vous pourrez toujours en ajouter par la suite // (You can always add
some later)
</p>
<InviteForm onSubmit={doSubmit} height="100px" width="200px" addBorder />
{formVals ? <pre>{JSON.stringify(formVals, null, 2)}</pre> : ""}
</div>
);
}
ReactDOM.render(<App />, document.body);

<script src="https://cdnjs.cloudflare.com/ajax/libs/react/16.9.0/umd/react.production.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/react-dom/16.8.6/umd/react-dom.production.min.js"></script>